Fuse



B. C. CANDEE AND F. MOESER.

FUSE.

APPLICATION FILED MAR. 2, 1917.

REHEWED MAY 20.1920.

Patenged Dec. 28, 1920.

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B" C. CANDEE AND Fi MOESER.

FUSE. y lAPPLICAM-[QN FILED MAR. 2.197. RENEWED MAY 20,1920. lf.D Y l y Patented Dec. 28, 1920. i 2 SHEETS-SHEET 2 455 '9 449 4445 4a y 59 6i 5 0 55j 42 l; ,-4 55g L 5 -45 55 y 4,3 53

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UNITED STATES BERTRAM C. CANDEE AND FRNK SIGESER,

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new Yoan, ASSIGNORS T0 PIERCE FUSE CORPORATION, 03? BFFLO, EW YS'RK, A CORPORATlON 0F NEW YORK.

FUSE.

Application filed March i912?, Serial No. 152,149.

To all whom f/nay co'rwcra.

Be it known that we, Bniirnaii C. Gennaio and FRANK Monsnii, citizens or" the Un'ted States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Fuses, oi which the following is a specification. l

This invention yrelates to a fuse which is capable of being refilled when the fusible link is melted by the passage ci' any ences sive current over the line in which the 'fuse is arranged.

The object of this invention is to provide a fuse of this character containing no loose pieces which are liable to get out of order, which has superior means for positively locking the fuse link in. vits operative position, which is so designed that the .saine must' be closed before it can be inserted in a fuse block and which is so constructed that neither sparks nor iiames can escape troni the fuse and endanger the surroundings when the fuse blows out.

In the accompanying drawings:

Figure' l is a longitudinal section of one form of fuse constructed in accordance with our improvements, the section being taken to show the dat sides oi the inse link and the terminals or poles. Fig. 2 is a similar view taken at right angles to Fig. l. Figs. 3, 4: and 5 are cross sections taken on the correspondingly numbered lines in iigs. l and 2. Fig. 6-is a longitudinal section oi a fuse containingour invention in a somewhat dii"- erent forni from that disclosed in Figs. 1-5, and also showing the tuse closed. Fig. 7 is a similar view showing the 'use open. Figs. 8 and 9 are cross sections taken on lines 8-8 and 9-9, Fig. 6, respectively.

Similar characters oi reference indicate corresponding parts throughout the several views.

The inclosing casing of the fuse shown in Figs. 1-5, preferably comprises an inner tubular section or body l which is provided in its side with an inlet opening 2 through which the fuse link 3 is introduced into the casing, and an outer tubular section or cover 4 which is slidable lengthwise on the inner casing section for the purpose of either covering the opening 2 or uncovering the same.

Specification of Letters Patent.

Fatented Dee. 28, 1920.

neaewefi so, ieee. serieu we. 382,927.

Both of these casing sections are constructed of insulating material such as fiber or the like.

The opposite ends of the inner casing sec-v tion or bodv are closed by means of front and rear heads 5, 5a arranged in these ends, each of these heads being preferably constructed. of a pair of inner and outer sheet metal cups 6, 7 which have their flanges telescoping'one over the other so that the concave sides of these cups face each other and the disks thereof are spaced apart and Jform a hollow iead, as best shown in Fig. 2.

ln its closed position the cover section of the casing has its rear end 8 arranged flush d with the corresponding rear end of the inner body section while its front end 9 is arranged beyond the opening in the body section but short of the front end of the latter. Surrounding the front end of the `body section of the casing in front of the cover section is a iilling ring or sleeve l0 of liber or similar material which is equal in thickness to-the cover section and practically forms an extension at the iront end of the latter when the saine is in its closed position, as shown in igs. l and 2.

1l, 12 represent two metal caps applied to opposite ends oi' the inclosing casing, the disk of the rear cap l2 extending across the outer ends o the cover and body sections and the rearpnietal head 7 while Aits flange surrounds the rear end of the cover section, and the iront cap 1l extendin with its disk across the outer ends of the lling ring 10 and the adjacent end of the body section and the front head S, as shown in Figs. l and 2. The rear cap l2 is secured to the rear end of the cover so as to inove therewith, this connectionbeing preferably eiiected by means of screws 13 passing transversely throu h these parts, as shown in Figs. l and 5. T e iront cap is secured to the filling ring, the body section and the iront head of the casing by" means oi screws 14E passing transversely through these parts, as shown in Figs. l and 3.

ln order to prevent the cover section of the casing troni being wholly detached from the body section a stop device is provided which preferably consists of two stop blocks 15,15 secured' to the inner side of the cover within the inlet opening 2 of the body section and adapted in the opened position of the cover to engage with the rear end of the wall of this opening and thereby prevent the cover from being detached from the body section. The inwai'd or forward movement of the coversection is limited by engagement of the disk of the rear cap with the adjacent rear end of the body section, also by engagement of the front end of the cover section with the filling ring and also by engagement of the stop blocks l5 with the front end of the wall of the inlet opening in the body section, as shown in Fig. 1. lThe stop blocks are preferably arranged on diametricaily opposite sides of the covei section and may be secured thereto by means of rivets 1G, as shown in Fig. 1, or by any other suitable means.

17, 18 represent the two poles or terminals of the fuse which are preferably constructed of fiat metal such as copper. These two poles are arranged lengthwise in c/orrespondingly shaped slots 19, 20 formed in the metal heads and the caps at opposite ends of the fuse casing so that each of these poles or terminals has anouter end arranged outside of the casing for attachment with the clips of a fuse block and an inner end which is arranged within the casing and adapted to receive one endof the fuse link. These poles or `terminals may be secured to the respective heads of the inner or body section by any suitable means but preferably by means of metal cross bars Q11, 22 arranged withinthe respective hollow heads and each connected with its central part to the re spective terminal by means of al rivet 23 while its opposite ends are provided with laterallyA projecting lugs 24E which engage with notches 24' in the opposite edges of the respective pole and are secured to the inner side of the respective hollow metal head. "lhe lugs of the cross bar 21 are held in place on the front head 6 by the same screws 14 which connect this head with the casing body, filling ring and the front cap, While the lugs of the rear cross bar 22 are connected with the rear head 'i' and the rear end of the body section by means of screws 25 passing transversely through these parts, as shown in Figs. land 5.

The poles or terminals are intended to be fitted fairly snug in the openings formed in the metal heads and caps at opposite ends of tlie casing sections but to guard against the passage of any flames outwardly through these openings when the fuse link melts or blows out each of the hollow heads is preferably filled with asbestos 26, as shown in Figs. 2, 3 and 5, or similar non-combustible or heat insulating material.

rlFhe fuse link may be attached to the inner ends of the poles or terminals lby any i ,e @este suitable means but the means which are shown in the drawings are preferred and constructed as follows:

27 represents a longitudinal slit formed in the inner end of each pole' or terminal and dividing the same into a pair of clamping jaws Q8, 29 which are adapted to engage with opposite sides of one end of the fuse link. Embracing the clamping jaws of each pole is a transverse yokel which comprises two parallel arms 30 engaging with notches 31 formed iii opposite edges of the clamping jaws, two inwardly off-set portions 32 on the lower ends of the arms and forming shoulders which engage with the underside of the lower jaw of the pole and a V-shaped brace 33 extending outwardly from the inner ends of said of`f-set portions and bearing against the adjacent part of the inner side of the body section, as shown in Figs. 2 and d. rl`he upper ends of the arms of the yoke are connected by a pin or rivet 3ft which extends across the top of the upper clamping jaw of the pole. 0n this pin is pivotally mounted an eccentric 35 which is provided with a laterally projecting handle or finger piece 36. Between the face of this eccentric and the upper clamping jaw is arranged a wearing piece or strip 37 which is held in place by providing its opposite ends with notches 38 which receive the adjacent arms of the yoke. Upon turning the eccentric so that the low part oi vits face is arranged opposite the clamping jaws thelatter by their resilience will be loosened sufficiently to permit one end of the fuse link to be freely inserted between the same and upon subsequently turning this eccentric so that the high part of its face is opposite the ciamping jaws then the latter will be pressed together and grip the fuse link sufficiently firm to produce a good contact. The wearing piece is preferably constructed of steel or other hard material so as to save the pole, which is usually made of copper or similar' material, from rapid wear.

The fuse link may be introduced through the inlet opening of the body section and secured to the pole while the cover section is niovedv lengthwise and backwardly relatively to the body section a sufficient distance to uncover the inlet of the casing. lli/*hen thus withdrawn the cover section incloses the outer attaching end of the rear pole or terminal and thereby renders it impossible to apply this fuse to the clips of a fuse block. ln order therefore to permit of attaching the outer ends of the poles to the clips of a fuse block it is necessary to first Yinove the `cover section forwardly von the body section until the inlet opening of the latter is completely closed, thereby preventing use ofthe 'fuse in the fuse block until the casing for the fuse link has been coinpletely closed, thus insuring against accin dents in the event that the fuse link out or melts.

The modified form of fuse shown in Figs. 6 9 of our' invention is constructed as ollows:

l39 represents the inner tubular body sectiony of the casing which is provided in its sides with two longitudinal slots or inlet openings 40. 4l represents the outer tubular cover section which is adapted to be moved lengthwise relatively to the inner or body section for the purpose of covering or uncoveringsaid inletl openings. Both or' these sections of the casing are constructed of fiber or similar electric insulating material. ln opposite ends of the body section are arranged metal heads 42, 43 which are secured thereto by means of transverse screws 44, 45. Each of these heads is pro vided with a longitudinal slit 46 extending outwardly from its inner face and diametrically across the respective head so that a fuse link 47 may be passed inwardiy through the opening 40 of the body section and between the jaws 48, 48 formed on each of the heads between the slit therein. After the ends of the fuse link have been thus inserted between the jaws of the heads these jaws may be drawn tightly against opposite sides or the fuse link by means oi' the same screws 44, 45 which connect these heads with the body section of the casing.

49, 50 represent two metal caps arranged at opposite ends or the casing, the disk of the front cap 49 extending across the front end of the body section and the front head of the' casing and having its flange overlapA ping the front end of the cover section in the closed position of the latter. This front Aburns cap is provided in its disk with a central` screw threaded opening 5l' which receives a screw threaded boss 52 on the outer end of the front head and is held againstturning thereon after the same has been assembled by means of brazing or soldering 543 or the like. rlhe flange of this front cap is also provided with an opening 54 in line with the head of the screw 44 so as to permit the latter to be turned by means o' a screw driver when the cover section is withdrawn. The rear cap 50 extends with its disk across the rear end of the cover section and the adjacent ends of the body section and rear head while its flange surrounds the rear part of the cover section. The disk of the rear cap is provided centrally with a screw threaded opening 55 which is adapted to engage with a screw threaded boss 56 on the outer side of the rear casing head in the assembled position of the parts and thereby hold the cover section in its closed position in which it eX- tends over the inlet openings in the body section and prevents any flames due to the melting or burning of the fuse link from reaching the exterior of the fuse and setting tire to anything which may be adjacent thereto. Complete withdrawal of the cover section of the casing from the body section thereof is prevented by means of a stop pin 57 arranged on the inner side of the front end of the cover section and adapted to engage with the 'rear enol 58 of a longitudinal groove 59 formed in the adjacent part of the outer side of the body section, as shown in Fig. .7. ln order to retain the rear cap 50 on the cover section and still permit the saine to be turned for screwing it on to the rear boss of the rear head the inner end of the flange of this cap is provided with an inwardly turned rim 60 which engages with a circumferential groove 6l in the adjacent part of the periphery of the cover section, as shown in Figs. 6 and 7. By this means all oi' the several parts of the fuse are permanently connected with each other but are iii-ee to move the requisite extent for reill ingthe :inse with new fuse links from time to time when required. c

n the construction of the fuse shown in lfigs. (5 9, the metal caps form the terminals or poles of the fuse which are adapted to engage with the clips of a fuse block and in this construction it also becomes necessary to fully close the cover section over the inlet openings in the body section before the cap-shaped poles are in a position to properly engage the clips of the fuse block, thereby insuring completev inclosure of the fuse link and guarding against accidents by fire when the same is in condition to be properly used.

1We claim as our invention:

1. A rpuse comprising an inner tubular casing-'section provided with an inlet opening in its side for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, terminals adapted to beconnected with said fuse link and to be engaged with a fuse block, and means 'for limiting the sliding movement of said casing sections relatively to one another. i

2. fuse comprising an inner tubular casing section provided with an inlet opening in itsside for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, terminals adapted to be connected with said fuse link and to be engaged with a fuse block. and means for limiting the sliding movement of said casing sections relatively to one another comprising a block arrangedon the inner side ot said outer casing section and adapted to engage with the wall of the opening in said inner casing section.

3. A fuse comprising an inner tubular casing section having an opening in its side for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, hollow heads arranged in opposite ends of said inner casing section and each composed oit two cup-shaped sections which telescope with their concave sides facing each other, and terminals mounted on said heads and adapted to be connected with a Jfuse link and a fuse block.

il. A. fuse comprising an inner tubular casing section having an opening in its side for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, hollow heads arranged in opposite ends of' said inner cas ing section land each composed of two cupshaped sections which telescope with their concave sides facing each other and which are provided with slots, and terminals arranged in the slots of said heads and adapted to be connected with a 'fuse link and a fuse block. Y

5. A fuse comprising an inner tubular casing section having an opening in its side for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, hollow heads arranged in opposite ends of said inner casing section and each composed of two cup-shaped sections which telescope with their concave sides facing each other and which are provided with slots, terminals arranged in the slots of said heads and adapted to be connected with a fuse link and a fuse block and each provided on its opposite edges within its companiony head with notches, and cross bars arranged in said heads and each connected with the respective terminal and provided at its opposite ends with lugs which are arranged in said notches of the terminals and are connected with the, adjacent head.

6. A fuse comprising an inner tubular casing section having an opening in its side for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, hollow heads arranged in opposite ends of said inner casing section and each composed of two cup-shaped sections which telescope with their concave sides facing eachother and which are provided with slots, an insulating filling arv ranged with each of said heads, and ter- 'minals arranged inthe slots of said heads and adapted to be connected with a inse link and a Afuse block.

7. A 'fuse comprising an inner tubular casing section having an opening in its side 'for the passage of a Yfuse link, an outer tubular casing section slida'ble lengthwise on said inner section, hollow heads arranged in opposite ends of said inner casing section and each composed of two cup-shaped sections which telescope with their concave sides facing each other and which are provided with slots, terminals "arranged in the slots of said heads and adapted to heconnected with a use link and a frise block, and cross bars arasesina-a ranged in said heads, respectively, and each connected centrally with. the adjacent terminal and at its ends with the companion head.

8. 'fuse comprising an inner tubular casing section having an opening in its side for the passage of a fuse link, an outer tubular casing section slidable lengthwise on said inner section, hollow heads arranged in opposite ends of said inner casing section and ach composed of two cup-shaped sections which telescope with their concave sides facing each other and which are provided with slots, terminals arranged in the slots of said heads and adaptedto be connected with a fuse link and a fuse block, and cross bars arranged in said heads, respectively, and each connected centrally with the adjacent terminal and provided at its ends with lugs which are connected with the inner side of 'the companion head.

S). A fuse comprising an inner tubular casing section having an inlet opening in its side for the passage ot' a fuse link, an outer tubular casing section slidable lengthwise on the inner casing section, heads arranged in opposite ends of said inner casing section, terminals arranged in said heads and adapted 'to be connected with a fuse link and with a fuse block,lcaps applied to opposite ends of said casing sections and having openings through which said terminals project, one of said caps being connected with the inner casing section and the other with the outer casing section, and a filling ring arranged between the inner casing section and the cap attached thereto and in line with the outer casing section.

l0. ik fuse comprising a casing, terminals arranged in the ends of the casing and each terminal provided at its inner end with two jaws which are adapted to grip a fuse link between them, and means for pressing 'the jaws of each terminal together comprising a yoke having two parallel arms engaging with notches in opposite edges of the respective terminal, off-sets at one end or" said arms and engaging with the outer side ot one jaw of a pair and a brace connecting said off-sets and bearing against the inner side of said inner casing section, a pin mounted transversely on the opposite ends of said arms, and an eccentric mounted on said pin and adapted to press against thev outer side ot the other jaw.

11. fuse comprising a casing, terminals l arranged in the ends of the casing and each terminal provided at its inner end with two jaws which are adapted to grip a fuse link between them, and means for pressing the jaws of each terminal together comprising a yoke having two parallel arms engaging with notches in opposite edges of the respective terminal. oft-sets at one. end of said arms` and engaging Wththe outer side of one jaw jawl and a Wearing plate arranged between of a pairvand a brace connecting said off-sets the eccentric and the adjacent jaw and proand bearing ,against the inner side of said vided at its ends With notches which receive l0 inner casing'secton, a pin mounted transthe arms of said yoke.

versely on the opposite ends of said arms, an

eccentric mounted on said pin and adapted BERTRAM C. CANDEE. to press against the outer side of the other FRANK MOESER. 

